Osmosis lecture maps cardiac structure, systemic blood distribution and vessel layers
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An Osmosis educational video walks through the cardiovascular system: the fist-sized, cone-shaped heart with its fibrous pericardium, myocardium, coronary supply, fibrous skeleton and endocardium, and the pathway of blood from the right heart through the lungs to the left heart, aorta, capillaries and veins. It quantifies systemic arterial distribution at roughly 15% to the brain, 25% each to the kidneys, gastrointestinal tract and skeletal muscle, and 5% to the skin, and contrasts high-pressure, low-volume arteries with low-pressure, high-volume valved veins. Capillary exchange across an endothelium and basement membrane is covered, including water-soluble passage between cells and direct lipid diffusion. The material is introductory medical physiology teaching rather than research findings, transcribed offline with Whisper, with terminology following the original video.
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- YouTubeCardiovascular Anatomy and Physiology: Cardiac Structure, Systemic Distribution and Vessel Layers (Osmosis)
The circulatory system equals the cardiovascular system: the heart pumps blood and vessels deliver and return it, exchanging O2 and nutrients for CO2 and waste. The heart has a fibrous pericardium, myocardium with coronary supply and fibrous skeleton, and endocardium, and is roughly fist-sized and cone-shaped. Blood flows right heart to lungs to left heart to aorta, capillaries and veins; roughly 15% of arterial blood goes to the brain, 25% to kidneys, 25% to gastrointestinal tract, 25% to skeletal muscle and 5% to skin. Arteries are high pressure and low volume; veins are low pressure and high volume with valves. Capillaries, made of endothelium plus basement membrane, exchange O2, CO2, glucose and interstitial fluid, with water-soluble substances passing between cells and lipids diffusing directly. This is introductory medical physiology teaching, not research findings (transcribed offline with Whisper; terms follow the original video).
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